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Date:      Tue, 11 Dec 2001 16:57:00 +0100
From:      Gabriel Ambuehl <gabriel_ambuehl@buz.ch>
To:        "Dustin Puryear" <dpuryear@usa.net>
Cc:        isp@freebsd.org
Subject:   Re[8]: Using DNAT and DNS round-robin
Message-ID:  <164616459602.20011211165700@buz.ch>
In-Reply-To: <PGECILGGNJGDPJKLFEMIEEMACIAA.dpuryear@usa.net>
References:  <PGECILGGNJGDPJKLFEMIEEMACIAA.dpuryear@usa.net>

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Hello Dustin,

Monday, December 10, 2001, 5:05:31 PM, you wrote:

> Well, one solution to this type of problem is to use remote storage
> such as NAS.

NAS has got the big problem of being a single point of failure. But
if
you can live with that, it's a great solution to achieve consistency
of the load balanced data. Watch out, though, cause FreeBSD 4.X
nfsclient doesn't currently support file locking!

> I am working with another client that uses several webservers that
> hit a few Snap servers for all of their data. Using this method we
> can load-balance (using LVS and Red Hat's High Availability
> Services) to our heart's content. But you are correct that there is
> a problem if you leave the data on the local drive of each server.

I'm working on something like FVS and despite the currently non
existent VS fail over and FS replication parts, it's working pretty
well (save for that fact that ipnat currently doesn't provide any
other load balancing than round robin but OTOH, the system is capable
to skip NAT altogether and use DNS round robin or whatever else which
isn't possible with LVS, IIRC).

I'm currently trying to port it to Linux (for a consulting client)
but
since Linux won't support bidirectional popen(), I'm somewhat stuck
until I manage to get a custom version of it to work...


Best regards,
 Gabriel

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